package com.youedata.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Url工具类
 *
 * @author liujijun
 */
public class UrlUtil {

    static Logger logger = LoggerFactory.getLogger(UrlUtil.class);

    /**
     * 获取URL文件的大小（byte）
     *
     * @param urlPath
     * @return
     */
    public static long getFileSize(String urlPath) {
        logger.info("文件路径为：{}", urlPath);
        long fileSize = 0;
        try {
            URL url = new URL(urlPath);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(10 * 1000);
            String size = conn.getHeaderField("Content-Length");
            logger.info("文件大小为：{}", size);
            fileSize = Long.parseLong(size);
        } catch (Exception e) {
            logger.error("文件大小获取失败", e);
        }
        return fileSize;
    }

    /**
     * 获取URL文件的大小（MB）
     *
     * @param urlPath
     * @return
     */
    public static double getFileSizeByMB(String urlPath) {
        double fileSize = 0L;
        if (getFileSize(urlPath) > 0) {
            fileSize = getFileSize(urlPath) * 1.0 / (1024 * 1024);
        }
        return fileSize;
    }

    /**
     * 从网络Url中下载文件
     *
     * @param urlStr
     * @param fileName
     * @param savePath
     * @throws IOException
     */
    public static File downLoadFromUrl(String urlStr, String fileName, String savePath) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置超时间为3秒
        conn.setConnectTimeout(3 * 1000);
        //防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        //得到输入流
        InputStream inputStream = conn.getInputStream();
        //获取自己数组
        byte[] getData = readInputStream(inputStream);

        //文件保存位置
        File saveDir = new File(savePath);
        if (!saveDir.exists()) {
            saveDir.mkdir();
        }
        File file = new File(saveDir + File.separator + fileName);
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(file);
            fos.write(getData);
            fos.close();
        } catch (Exception e) {
            logger.error("error:", e);
            if (null != fos) {
                try {
                    fos.close();
                } catch (IOException e1) {
                    logger.error("close FileOutputStream error:", e1);
                }
            }
        }
        inputStream.close();
        return new File(savePath, fileName);
    }

    /**
     * 从网络Url中获取文件流
     *
     * @param urlStr
     * @throws IOException
     */
    public static InputStream getStreamFromUrl(String urlStr) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置超时间为3秒
        conn.setConnectTimeout(3 * 1000);
        //防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        //得到输入流
        InputStream inputStream = conn.getInputStream();

        inputStream.close();
        return inputStream;
    }

    /**
     * 从输入流中获取字节数组
     *
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }

    public static void main(String[] args) {
        try {
            downLoadFromUrl("http://101.95.48.97:8005/res/upload/interface/apptutorials/manualstypeico/6f83ce8f-0da5-49b3-bac8-fd5fc67d2725.png",
                    "百度.jpg", "d:/resource/images/diaodiao/country/");
        } catch (Exception e) {
            logger.error("error:", e);
        }
    }
}
